Improvement in low-water indicator



HENRY REYNOLDS, CE NEW HAVEN, CONNECTICUT, ASSIGNCR TC REY- NOLDS di CO., CF SAME PLACE.

Letters Patent No. 97,228, dated November 23. 1869; antedated November l2, 1869.

IMPROVEMENT IN LQW-WATER INDICATOR.

The Schedule referred to in these Lettera P atem: and making part 0f the Rame To all whom 'it may concern:

Beit known that I,.HENRY REYNOLDS, of New Haven, vin the county of New Haven, and State of Connecticut, have invented a LowWVatr Detector; and I do hereby declare the following, .when taken in connection with the accompanying drawings, and the letters of reference marked thereon, to be a full, clear, and exact`description of' ythepsameg and which said drawings constitute part of this specification, and represent, in

Figure 1, a front view illustrating'my improvement, and in k i Figure 2, the common device upon which my improvement is made.

This,inventionrelates to an improvement in lowwater alarm or detector for steamhoilers, such as are arranged to be operated by expansion of the tube into which the hot steam passes at low water, andy such as is shown in iig. 2, irf'wllich A is the tube, arranged so as to communicate with the boiler at ornear the lowwater mark, and-so that when the boiler is lled above that point, the tube is filled with water, and being exposed, is comparatively -at a low temperature, but

when the water falls below the line of the tube, the

water in the tube Hows out into the boiler, being im-` mediately'replaced by'hot steam, which causes the expansion ot"- thetube.

To the tube a, cross-head, B, is firmly fixed. The other end of the tube, at. C, isfirmly xed to a plate, I), and over the tube another cross-head, E, is arranged, so as to slidenon the tube.

lhe two cross-heads, B and E, are connected by rods a and b, and between thecross-head E and fixed block F, on the plate D, a bar, f, is arranged'.

By this arrangement, the expansion ofthe tube, increasing its length, draws the cross-head E toward the blockh, compressing the bar j, whichv causes it to rise in the centre, over which a whistle-valve, G, is placed,

`so that the rising-ofthe bar f will open the -valve and cause the alarm.

new Improvement in Heretofore, in securing the rods c and b to the crossheads E, nuts have been placed upon both sides oi' the crosshead,fas seen in iig. 2.

In practical use, it is found that the constant expansion and contraction loosen the nuts, and cause them to yield more or less, so that the instrument is not sufficiently' positive for practical use.

To overcome this is the object of my invention, which 'consists in attaching the two cross-heads together by cutting upon the respective ends of the connecting-rods, a right and left-hand thread, and tapping the crosshead accordingly, so that when the instrument is adjusted, the rods will not move to affect the relative position ot' the cross-heads.

In order to theclear understanding of my invention, I will fully describe the same as illustrated in thev accompanying drawings.

The whole machine is constructed the same as b efore described, with this exception, that the rods a and b are, upon one end, cut with a right-hand thread, and upon the .opposite end, a leftliand thread, the

two cross-heads tapped accordingly, then the twoheads attached together, as seen in fig. 1, withoutrthe employment ofthe nuts, so' that whatever may be the operation upon the rods, the relative position is not changedl Witnesses:

J OBN H. SHUMWAY, A. J. Tmirs. 

